AP Photo/Elaine ThompsonIt should be interesting to see how the USC defense evolves this spring with Justin Wilcox calling the shots.

Garry Paskwietz: I’ll be watching to see how the defense begins to take shape under new coordinator Justin Wilcox. One of the things that worked so well for the Trojans last season was the way the USC defensive personnel fit so smoothly within the 5-2 scheme utilized by former coordinator Clancy Pendergast. Wilcox says he wants to get a look at the USC players on the field to see how their skills fit before he commits to a particular scheme, so it could be a very fluid situation in spring. How does the rotation look along the line, especially with the need to replace George Uko? Who steps up to fill the edge-rush spots at outside linebacker? Will Su’a Cravens be used in much the same way Shaq Thompson was at Washington? These and many other questions will begin to get answered when the Trojans hit the field next month.

Johnny Curren: I’m most interested to see how the new up-tempo offense that USC coach Steve Sarkisian plans to install comes along, and how the current Trojans players adapt to playing in it. Sarkisian has stated before that although fast-paced, it will still essentially be a pro-style, run-first offense, but there are still bound to be several significant differences from USC offenses of the past, and there are plenty of questions heading into the spring that won’t begin to be answered until the team hits the practice field. Will one of the quarterbacks -- Cody Kessler, Max Browne or Jalen Greene -- prove to be particularly adept at directing the new attack? Will the quarterbacks be asked to run more? Will more of an emphasis be placed on throwing to the tight end, as Sarkisian did at Washington, and will Randall Telfer and Jalen Cope-Fitzpatrick thrive in the potentially expanded role? Will we see more wideouts involved? Will the fullback really be utilized? Most importantly, though, will it all result in an offense that is more explosive, and in the end, more productive? In less than a month we’ll start to find out.

Greg Katz: The O-line gets top billing here, especially the center position, which is key with the early departure of All-Pac-12 center Marcus Martin to the NFL draft. The candidates or position changes as it pertains to center could be fascinating because it could lead to a domino effect. Keep an eye on redshirt freshman Khaliel Rodgers, who should be a prime candidate for either center or guard. Another sidebar to the offensive line, of course, is the arrival of new coach Tim Drevno from the San Francisco 49ers. Watching his readjustment to college players and what’s available to him should be worth watching at spring practice.

As for an overall view, with a new system and terminology, the logical advantage for returners such as left tackle Chad Wheeler and right tackle Max Tuerk is starting experience. Tuerk, however, is one to keep an eye on to see if he stays at right tackle and is not moved to center. Rehabilitation for guards Jordan Simmons and Aundrey Walker make spring progress tough, but it should make for interesting competition to see how the available bodies fit into Sark’s “puzzle pieces.” What you see in the spring might not be the offensive line you see in the first game against Fresno State.